CN115090913A - Indexable insert and turning tool - Google Patents

Abstract

The invention belongs to the field of machining tools, and particularly discloses an indexable blade and a turning tool which are beneficial to chip discharge. The indexable insert is characterized in that an arc-shaped groove is formed on a rotary part formed by extending the periphery of an insert main body towards one side of the insert main body to process a cutting part, the cutting part is equivalent to a structure formed by extending part of the periphery of the insert main body outwards along the axial direction, and the insert main body needs to be inclined towards the cutting feed direction in the use process so as to ensure that the cutting part at a working position exceeds other cutting parts forwards, therefore, a natural inclined angle exists in the use process of the indexable insert, a certain guiding effect is provided for chips flowing out from the front side of the cutting part, the chips are favorably curled towards one direction and are outwards discharged, and the cutter tip is not wound basically; meanwhile, the arc-shaped groove is formed in the rotary part, so that chips are guided and discharged, and the chips are basically not accumulated between the front surface of the cutting part at the working position and the back surface of the cutting part adjacent to the cutting part.

Description

Indexable blade and turning tool

Technical Field

The invention belongs to the field of machining tools, and particularly relates to an indexable blade and a turning tool.

Background

Indexable inserts are inserts that can be used indexable and can be of various kinds, for example: threading inserts, outside diameter turning inserts, outside diameter grooving inserts, face grooving inserts, and the like.

Indexable inserts typically have multiple cutting portions, and when one of the cutting portions is worn, the rotatable insert uses the other cutting portion for cutting. For example: the patent of the Chinese utility model with the publication number of CN213410682U discloses a vertically-mounted threading machine blade, which comprises a blade main body, wherein the blade main body is provided with a mounting hole and at least two cutting parts, and the cutting parts are circumferentially and uniformly distributed by taking the mounting hole as a center; the outer contour surfaces of the cutting parts are positioned on the same rotary curved surface, the axis of the rotary curved surface is the central line of the mounting hole, and the generatrix of the rotary curved surface is matched with the thread form; in the circumferential direction of the insert body, one surface of the cutting portion is a cutting portion front surface, the other surface is a cutting portion back surface, and an intersection line of the cutting portion front surface and the outer contour surface is a cutting edge.

Although the cutting part of the vertical threading lathe blade is arranged in the circumferential direction of the blade main body, so that the vertical threading lathe blade is convenient to machine, more cutting parts can be manufactured, and the position accuracy of a cutting edge and a tool tip relative to the center of the blade is easy to ensure, the cutting part of the vertical threading lathe blade is equivalent to a structure formed by locally extending the periphery of the blade main body outwards along the radial direction, an angular bisector of a tool tip angle of the cutting part is vertical to the axial line of the blade main body, and the angular bisector of the tool tip angle of the cutting part is vertical to the axial line of a workpiece in the threading process, otherwise, the tooth shape distortion problem is generated, so that the axial line of the blade main body is parallel to the axial line of the workpiece in the use process of the vertical threading lathe blade, the blade main body has no guiding effect on chips, and the chips generated in the cutting process are easy to accumulate between the front surface of the cutting part of the working position cutting part and the back surface of the cutting part of the adjacent cutting part after flowing out along the front surface of the cutting part, namely, in the chip groove of the blade, the problems that chips are wound around the blade tip, the abrasion of the cutting part is aggravated, the workpiece is scratched and the like occur, so that the service life of the blade is shortened, and the processing quality of the workpiece is reduced.

Disclosure of Invention

The invention aims to provide an indexable insert which is beneficial to chip discharge.

The technical scheme adopted by the invention for solving the technical problems is as follows: the indexable insert comprises an insert main body, wherein the insert main body is provided with a mounting hole and a cutting part positioned on the periphery of the mounting hole;

the cutting part comprises a side contour surface, a cutting part front surface and a cutting part back surface;

the periphery of the blade main body extends towards the direction departing from one side face of the blade main body to form a rotary part, and the rotary axis of the rotary part is collinear with the axis of the mounting hole;

at least two arc-shaped grooves are formed in the rotary part, and a bulge formed between every two adjacent arc-shaped grooves is the cutting part;

the side profile surface of the cutting part is positioned on the revolution surface of the revolution part, and the front surface and the back surface of the cutting part on the same cutting part respectively correspond to different arc-shaped grooves.

Furthermore, the number of the cutting parts is at least two, and the front surface of the cutting part and the back surface of the cutting part corresponding to the same arc-shaped groove are connected in a smooth transition mode through the arc-shaped part.

Further, the cutting portions are uniformly distributed on the circumference centering on the mounting hole.

Furthermore, the front surface of the cutting part is a plane, and the back surface of the cutting part is an arc-shaped surface.

Further, the indexable insert is a thread-cutting insert in which the cross section of the revolution portion thereof is matched with the profile of the thread to be cut and the taper C of the inner surface of the revolution portion thereof _{Inner part} Greater than taper C of the outer surface _{Outer cover} 。

Furthermore, the front surface of the cutting part is intersected with the side contour surface to form two main cutting edges, the included angle between the two main cutting edges is the tool sharp angle theta of the cutting part where the two main cutting edges are positioned, and the theta is more than or equal to 30 degrees and less than or equal to 60 degrees.

The invention also provides an indexable turning tool beneficial to chip discharge, which comprises a tool bar and a blade arranged on the tool bar, wherein the blade is the indexable blade;

the front end of the cutter rod is provided with an installation part, and the blade is obliquely arranged on the installation part through the blade main body, so that the tool tip of the cutting part in the working position is forwards beyond the tool tips of other cutting parts, and the other cutting parts do not interfere with a workpiece in the working process.

Furthermore, the indexable turning tool is a turning tool for thread processing;

the number of the cutting parts is eight, the included angle between the blade main body and the axial lead of the cutter bar is alpha, and the alpha is 75 degrees;

the angle bisector of the knife-point angle of the cutting part at the working position is parallel to the axial lead of the cutter bar.

Furthermore, the blade main body is provided with a positioning part, and the positioning part is provided with first positioning structures which correspond to the cutting parts one by one;

the cutter bar is provided with a second positioning structure;

and the cutting part is positioned at the working position, and the corresponding first positioning structure is matched and connected with the second positioning structure.

Further, the first positioning structures are first positioning holes with the same number as the positioning parts;

the second positioning structure is a second positioning hole;

the second positioning holes are matched and connected with the corresponding first positioning holes through positioning pieces.

The invention has the beneficial effects that:

1) the cutting part is processed by arranging an arc-shaped groove on a rotary part formed by extending the periphery of the insert main body towards one side of the insert main body, the cutting part is equivalent to a structure formed by extending the periphery of the insert main body outwards along the axial direction, the insert main body needs to be inclined towards the cutting feed direction in the use process so as to ensure that the cutting part at the working position exceeds other cutting parts forwards and ensure that other cutting parts do not interfere with a workpiece, therefore, a natural inclined angle exists in the use process of the indexable insert, a certain guiding effect is provided for chips flowing out from the front side of the cutting part, the generated chips are favorably curled towards one direction and are outwards discharged, and a tool nose is basically not wound; particularly, when the thread is machined, because the included angle between the angle bisector of the sharp corner of the cutting part and the axial lead of the blade main body is usually less than 45 degrees, the included angle between the axial lead of the blade main body and the axial lead of a workpiece is more than 45 degrees, and chips are more favorably curled in one direction and smoothly discharged; meanwhile, the arc-shaped groove is formed in the rotary part, so that chips are guided and discharged, the chips are basically not accumulated between the front surface of the cutting part of the working position and the back surface of the cutting part of the adjacent cutting part, the problems that the chips are wound around a cutter point, the abrasion of the cutting part is aggravated, workpieces are scratched and the like are further avoided, and the service life and the processing quality of the blade are ensured.

2) When the indexable insert is manufactured, the whole body and the mounting hole with the conical structure are firstly processed, and then the arc-shaped groove is formed in the rotary part to process the cutting part, so that the indexable insert is simple to manufacture, is very suitable for pressing and drawing the hard alloy insert, has a simple structure, does not have an additional complex curved surface and a positioning device, and is low in production cost; moreover, the position accuracy of the cutting edge and the tool nose relative to the center of the blade is favorably ensured; in addition, the matched cutter bar is simple to manufacture.

3) Because the cutting part of the indexable insert is equivalent to a structure formed by extending the periphery of the insert main body outwards along the axial direction, the cutting part which is not at the working position in the using process can be effectively prevented from interfering with a workpiece by controlling the length and the inclined angle of the cutting part, so that the cutting part can be flexibly arranged according to the actual condition, and more cutting parts can be favorably arranged to prolong the service life of the insert.

4) The indexable insert has a wide application range, and can be used as a threading insert, an outer diameter turning insert, an outer diameter groove insert, an end surface groove insert and the like.

Drawings

FIG. 1 is a schematic view of an embodiment of the indexable insert of the present invention;

FIG. 2 is a front view of an indexable insert in the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic view of an embodiment of a front blade body with an arc-shaped groove formed in a revolving part;

FIG. 5 is a side view of the front insert body with the rotary portion defining an arcuate recess;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 5;

FIG. 7 is a schematic view of an embodiment of the indexable turning tool of the present invention;

FIG. 8 is a side view of the indexable turning tool of the present invention;

FIG. 9 is a schematic view of an embodiment of the tool bar;

FIG. 10 is a first schematic view of an indexable turning tool in a first working state for machining threads according to the present invention;

FIG. 11 is a schematic view showing a second working state of the indexable turning tool for machining threads according to the present invention;

FIG. 12 is a third schematic view showing the operation of the indexable turning tool for machining threads according to the present invention;

FIG. 13 is a fourth schematic view showing the operation of the indexable turning tool for machining threads according to the present invention;

labeled as: the insert comprises an insert body 100, a mounting hole 110, a cutting portion 120, a side contour surface 121, a cutting portion front surface 122, a cutting portion back surface 123, a main cutting edge 124, an arc-shaped portion 125, a cutting edge 126, an angular bisector 127, a positioning portion 130, a first positioning structure 131, a turning portion 200, a turning axis 210, an arc-shaped groove 220, a curved surface of revolution 230, a tool shank 300, a mounting portion 310, a second positioning structure 320, a workpiece 400, and chips 500.

Detailed Description

The invention will be further explained with reference to the drawings.

In the description of the present invention, it should be noted that the terms "front", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description, and do not indicate or imply that the referred devices or components must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. The nose angle is the angle between the major and minor cutting edges measured in the base plane. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 to 6, the indexable insert includes an insert body 100, the insert body 100 having a mounting hole 110 and a cutting portion 120 located at a circumferential periphery of the mounting hole 110;

the cutting portion 120 comprises a side contour surface 121, a cutting portion front surface 122 and a cutting portion back surface 123;

the periphery of the blade main body 100 extends towards a direction departing from one side face of the blade main body 100 to form a rotary part 200, and the rotary axis 210 of the rotary part 200 is collinear with the axis of the mounting hole 110;

at least two arc-shaped grooves 220 are formed in the revolving portion 200, and a protrusion formed between every two adjacent arc-shaped grooves 220 is the cutting portion 120;

the side contour surface 121 of the cutting portion 120 is located on the curved surface of revolution 230 of the revolution 200, and the cutting portion front surface 122 and the cutting portion back surface 123 on the same cutting portion 120 correspond to different arc-shaped grooves 220, respectively.

The indexable insert is provided with an arc-shaped groove 220 on a rotary part 200 formed by extending the periphery of an insert main body 100 towards one side of the insert main body, the cutting part 120 is equivalent to a structure formed by extending part of the periphery of the insert main body 100 outwards along the axial direction, and the indexable insert needs to incline the insert main body 100 towards the cutting direction during use so as to ensure that the cutting part 120 in a working position exceeds other cutting parts 120 forwards and ensure that other cutting parts 120 do not interfere with a workpiece 400, so that a natural inclined angle exists during use of the indexable insert, a certain guiding effect is provided for chips 500 flowing out of a front surface 122 of the cutting part, the generated chips 500 are favorably curled outwards towards one direction, and the cutter edge is not wound basically, as shown in fig. 10; particularly, when a thread is machined, because the included angle between the bisector 127 of the tool tip angle of the cutting part 120 and the axis of the insert main body 100 is usually less than 45 degrees, the included angle between the axis of the insert main body 100 and the axis of the workpiece 400 is more than 45 degrees, which is more favorable for curling the chips 500 in one direction and discharging the chips smoothly; meanwhile, the arc-shaped groove 220 is formed in the revolving part 200, so that the chips 500 are guided and discharged, the chips 500 are basically not accumulated between the front surface 122 of the cutting part 120 at the working position and the back surface 123 of the cutting part of the adjacent cutting part 120, the problems that the chips 500 are wound around the tool tip, the abrasion of the cutting part 120 is aggravated, the workpiece 400 is scratched and the like are further avoided, and the service life and the processing quality of the blade are ensured.

When the indexable insert is manufactured, the whole body with the conical structure and the mounting hole 110 are firstly processed, and then the arc-shaped groove 220 is formed in the rotary part 200 to process the cutting part 120, so that the indexable insert is simple to manufacture, is very suitable for pressing and drawing the hard alloy insert, has a simple required mold structure, does not have additional complex curved surfaces and positioning devices, and is low in production cost; moreover, the position accuracy of the cutting edge and the tool nose relative to the center of the blade is favorably ensured; in addition, the matched cutter bar is simple to manufacture. The cutting parts 120 with different numbers can be manufactured by changing the number and the shape of the arc-shaped grooves 220, and because the cutting parts 120 of the indexable insert are equivalent to a structure formed by extending the periphery of the insert body 100 outwards along the axial direction, the cutting parts 120 which are not in a working position in the use process can be effectively prevented from interfering with the workpiece 400 by controlling the length and the inclined angle of the cutting parts 120, so that the cutting parts 120 can be flexibly arranged according to actual conditions, more cutting parts 120 can be favorably arranged, and the service life of the insert is prolonged. The embodiment of fig. 1 and 2 is an insert having eight cutting portions 120.

Wherein the insert body 100 is a base body of the indexable insert, which is generally a centrally symmetric structure, preferably a truncated cone-shaped structure; the mounting hole 110 is a through hole formed in the cutter body 100 for connection with the cutter bar 300 or the cutter head; the mounting hole 110 is generally formed at a central portion of the cutter body 100, and the cutter body 100 is generally coupled to the cutter bar 300 or the cutter head through the mounting hole 110 by means of a coupling member such as a screw or a bolt.

The cutting portion 120 is a structure of the insert body 100 for cutting the workpiece 400; the side contour surface 121 refers to both the inner and outer side surfaces of the cutting part 120 and a transition surface between the inner and outer side surfaces; the cutting portion front surface 122 is a rake surface of the cutting portion 120, which is a rake surface that directly acts on the metal layer to be cut and controls the discharge of the chip 500 therealong; the cutting portion back surface 123 is the surface of the cutting portion 120 on the side opposite the cutting portion front surface 122 and is used to guide the chip 500.

The indexable insert has a wide application range, and can be used as a threading insert, an outer diameter turning insert, an outer diameter groove insert, an end surface groove insert and the like. When the cutting tool is used for machining triangular threads or V-shaped grooves, the cutting part front surface 122 and the side contour surface 121 are intersected to form a V-shaped cutting edge; when the cutting portion is used for machining a trapezoidal thread or a trapezoidal groove, the cutting portion front surface 122 and the side contour surface 121 are intersected to form a cutting edge in the form of "the Chinese"; if the tool is used for machining rectangular threads or rectangular grooves, the cutting portion front surface 122 and the side contour surface 121 are intersected to form a U-shaped cutting edge; when used for machining curved threads or curved grooves, the cutting portion front surface 122 and the side profile surface 121 are intersected to form a n-shaped cutting edge; similarly, when the cutting tool is used for machining threads or grooves having other shapes, the cutting portion front surface 122 and the side contour surface 121 may intersect to form a cutting edge having a corresponding contour shape.

Preferably, as shown in fig. 1, 2 and 3, at least two cutting portions 120 are provided, and the cutting portion front surface 122 and the cutting portion back surface 123 corresponding to the same arc-shaped groove 220 are smoothly transitionally connected by the arc-shaped portion 125. The arcuate portion 125 not only provides a smooth transition between the cutting portion front surface 122 and the cutting portion back surface 123, which improves the integrity and strength of the indexable insert, but also provides guidance for chips 500 that are discharged along the cutting portion front surface 122, which improves chip removal.

In order to improve the stability and ease of indexing use of the indexable insert, it is preferable that the cutting portions 120 are uniformly distributed on the circumference centering on the mounting hole 110, as shown in fig. 2.

In order to further enhance the chip removal effect of the indexable insert, as shown in fig. 1 and 3, the cutting portion front surface 122 is provided as a flat surface, and the cutting portion rear surface 123 is provided as an arc-shaped surface. In this manner, after the chip 500 discharged from the cutting portion front surface 122 is guided by the arc-shaped portion 125, the chip 500 can be further guided by the cutting portion rear surface 123 having an arc-shaped structure, so that the chip 500 can be wound along the cutting portion rear surface 123 and guided in the tangential direction of the revolving portion 200, and at the same time, in cooperation with the insert main body 100 having a natural inclination angle, it is further facilitated to curl the chip 500 outward in one direction, as shown in fig. 10.

The turning part 200 is a structure in which the cutting part 120 is machined in the insert body 100, and as shown in fig. 4 and 6, the turning part 200 is generally a structure in which the thickness of the turning part 200 is gradually reduced along the extending direction thereof; the swivel axis 210 is the axis of the swivel part 200 and also serves as the center line around which the indexable insert rotates during indexing; the arc-shaped groove 220 is a groove formed in the rotary portion 200 and also serves as an insert chip pocket, and has the same curvature as that of the curved surface 230 of the rotary portion 200.

As shown in fig. 3, the arc-shaped groove 220 between any two adjacent cutting portions 120 has a groove bottom surface mainly composed of the cutting portion front surface 122 of one of the cutting portions 120, the cutting portion back surface 123 of the other cutting portion 120, and the arc-shaped portion 125 smoothly connecting the cutting portion front surface 122 and the cutting portion back surface 123 corresponding to each other. It can be seen that the cutting portion back surface 123 is a main portion of the bottom surface of the arc-shaped groove 220, and the arc-shaped groove 220 can be effectively avoided from the workpiece 400 by arranging the cutting portion back surface 123 as an arc-shaped surface, so as to prevent other portions of the blade from interfering with the workpiece 400, as shown in fig. 10, 11, 12 and 13.

As a preferable mode of the present invention, as shown in FIG. 1 to FIG. 6, the indexable insert is an insert for thread cutting, the cross section of the turn portion 200 of which matches the profile of the thread to be cut, and the taper C of the inner surface of the turn portion 200 _{Inner part} Taper C greater than the outer surface _{Outer cover} . Since the angle bisector 127 of the point angle of the cutting portion 120 must be perpendicular to the axis of the workpiece 400 during the turning of the thread, in order to facilitate the forward protrusion of the cutting portion 120 in the working position and to prevent the interference of the other cutting portions 120 with the workpiece 400, it is necessary to make the taper C of the inner surface of the revolving portion 200 _{Inner part} Greater than taper C of the outer surface _{Outer cover} In this way, the bisector 127 of the cutting tip of the cutting portion 120 is inclined outward for ease of use.

On the basis, in order to facilitate the machining of the triangular thread, as shown in fig. 3 and 8, the cutting portion front surface 122 and the side contour surface 121 intersect to form two main cutting edges 124, an included angle between the two main cutting edges 124 is a tool tip angle θ of the cutting portion 120, and θ is greater than or equal to 30 ° and less than or equal to 60 °. Since the cutting portion front surface 122 as a plane corresponds to a base surface, the included angle between the two main cutting edges 124 thereof is the point angle of the cutting portion 120; it is preferable that the cutting portion 120 has a point angle of 55 °.

The invention also provides an indexable turning tool, which is shown in a combined manner in fig. 1 to 8 and comprises a tool bar 300 and an insert arranged on the tool bar 300, wherein the insert is the indexable insert;

the front end of the cutter bar 300 is provided with a mounting part 310, and the cutter blade is obliquely arranged on the mounting part 310 through the cutter blade main body 100, so that the cutter point 126 of the cutting part 120 in the working position is forwards beyond the cutter points 126 of other cutting parts 120; that is, in the cutting part 120 in the working position, the cutting edge 126 is positioned in front of the cutting edge 126 of the other cutting part 120; thereby ensuring that the other cutting portions 120 do not interfere with the workpiece 400 during operation. The mounting portion 310 may be of various configurations, preferably a half-groove that mates with the insert body 100.

As shown in fig. 10, 11, 12, and 13, when the workpiece 400 is machined by using the indexable turning tool, it is necessary to perform interference inspection on the upper and lower portions of the cutting part 120 in the working position; if there is interference, it is necessary to replace the blades of other sizes. As can be seen from fig. 13, the cutting portion 120 in the working position cuts the workpiece 400, and the other cutting portions 120 are spaced apart from the workpiece 400, particularly two cutting portions 120 vertically adjacent to the cutting portion 120 in the working position.

Preferably, as shown in fig. 8, the indexable turning tool is a turning tool for thread processing;

the number of the cutting parts 120 is eight, the included angle between the axial lead of the blade main body 100 and the axial lead of the cutter bar (300) is alpha, and the alpha is 75 degrees;

in the cutting part 120 in the working position, the angle bisector 127 of the tool tip angle is parallel to the axis of the tool holder 300. So, do benefit to the clamping use of this transposition formula lathe tool to guarantee its stability, do benefit to moreover and improve its life and ensure the machining precision.

In order to facilitate quick positioning and fixing of the insert on the toolholder 300 after the indexing adjustment, as shown in fig. 7 to 9, the insert main body 100 is provided with a positioning portion 130, and the positioning portion 130 has first positioning structures 131 corresponding to the cutting portions 120 one by one;

the cutter bar 300 is provided with a second positioning structure 320;

the cutting portion 120 in the working position is connected with the corresponding first positioning structure 131 in a matching manner with the second positioning structure 320. Through the cooperation of the first positioning structure 131 and the second positioning structure 320, the cutting part 120 which needs to be used is conveniently and quickly adjusted to a working position, and the blade main body 100 can be prevented from rotating due to stress during cutting.

The first positioning structure 131 and the second positioning structure 320 may be various, for example: buckle structure, assorted arch and recess, locating pin and locating hole etc..

In order to facilitate the processing and ensure a good positioning effect, as shown in fig. 7 and 9, the first positioning structures 131 are first positioning holes equal in number to the positioning portions 130;

the second positioning structure 320 is a second positioning hole;

the second positioning holes are matched and connected with the corresponding first positioning holes through positioning pieces. The positioning element can be various, for example: set screws, latches, etc.

Claims (10)

1. The indexable insert comprises an insert main body (100), wherein the insert main body (100) is provided with a mounting hole (110) and a cutting part (120) positioned on the circumferential periphery of the mounting hole (110);

the cutting portion (120) comprises a side profile surface (121), a cutting portion front surface (122) and a cutting portion back surface (123); the method is characterized in that:

the periphery of the blade main body (100) extends towards a direction departing from one side surface of the blade main body (100) to form a rotary part (200), and the rotary axis (210) of the rotary part (200) is collinear with the axis of the mounting hole (110);

at least two arc-shaped grooves (220) are formed in the rotary part (200), and a bulge formed between every two adjacent arc-shaped grooves (220) is the cutting part (120);

the side profile surface (121) of the cutting part (120) is positioned on the revolution surface (230) of the revolution part (200), and the cutting part front surface (122) and the cutting part back surface (123) on the same cutting part (120) respectively correspond to different arc-shaped grooves (220).

2. The indexable insert of claim 1 wherein: the number of the cutting parts (120) is at least two, and the cutting part front surface (122) and the cutting part back surface (123) corresponding to the same arc-shaped groove (220) are connected in a smooth transition mode through the arc-shaped part (125).

3. The indexable insert of claim 2 wherein: the cutting portions (120) are uniformly distributed on the circumference centering on the mounting hole (110).

4. The indexable insert of claim 2 wherein: the cutting part front surface (122) is a plane, and the cutting part back surface (123) is an arc surface.

5. The indexable insert of any one of claims 1 to 4 wherein: the indexable insert is a thread-cutting insert, the cross section of the rotary part (200) of which matches the profile of the thread to be cut, and the taper C of the inner surface of the rotary part (200) of which _{Inner part} Greater than taper C of the outer surface _{Outer cover} 。

6. The indexable insert of claim 5 wherein: the front surface (122) of the cutting part is intersected with the side contour surface (121) to form two main cutting edges (124), the included angle between the two main cutting edges (124) is the tool tip angle theta of the cutting part (120) where the two main cutting edges are positioned, and the theta is more than or equal to 30 degrees and less than or equal to 60 degrees.

7. Indexable turning tool, including cutter arbor (300) and install the blade on cutter arbor (300), its characterized in that: the insert is an indexable insert according to any one of claims 1 to 6;

the front end of the cutter rod (300) is provided with a mounting part (310), the cutter blade is obliquely arranged on the mounting part (310) through the cutter blade main body (100), so that the cutter point (126) of the cutting part (120) in the working position is forwards beyond the cutter points (126) of other cutting parts (120), and the other cutting parts (120) are not interfered with the workpiece (400) in the working process.

8. The indexable turning tool of claim 7, wherein: the indexable turning tool is a turning tool for thread processing;

the number of the cutting parts (120) is eight, the included angle between the blade main body (100) and the axial line of the cutter rod (300) is alpha, and the alpha is 75 degrees;

the cutting part (120) in the working position has an angle bisector (127) of the knife-point angle parallel to the axis of the knife bar (300).

9. An indexable turning tool according to claim 7 or 8, wherein: the blade main body (100) is provided with a positioning part (130), and the positioning part (130) is provided with first positioning structures (131) which correspond to the cutting parts (120) one by one;

a second positioning structure (320) is arranged on the cutter bar (300);

and the cutting part (120) is positioned at the working position, and the corresponding first positioning structure (131) is matched and connected with the second positioning structure (320).

10. The indexable turning tool of claim 9, wherein: the first positioning structures (131) are first positioning holes with the same number as the positioning parts (130);

the second positioning structure (320) is a second positioning hole;

the second positioning holes are matched and connected with the corresponding first positioning holes through positioning pieces.

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